Try rebooting your router. Unplug it for a few minutes, then plug it back in. While you are at this, go into your computer wifi settings and tell us what settings you have. Also what other computer equipment is running of the router.
Try many time also with a complete wipe system ... seem that the new FW dont realize the pysical mac addrss ... Bad notice !!!! I think that the problem is the update with DM 7.1 (BETA) n the developer mode on before the update procedure